PHOENIX -- Phoenix police are asking for the public's help locating a suspect wanted in a double homicide.

A 25-year-old man and a 17-year-old girl were found shot to death late Monday night. Sgt. Trent Crump said the bodies were found in a bed in a small residence behind a home in the area of 27th Street and Indian School Road.

Investigators have identified the victims as Jose Alonso Villa and Kristen Bianca Furgeri. Both victims were known by their middle names. Friends and relatives told 3TV that the victims were a couple and that the main home where the crime occurred belongs to Villa's family.

According to Crump, officers discovered the bodies of Villa and Furgeri while responding to a call about gunfire in the area. People in the main house heard the shots at about 11:30 p.m.

Crump said witnesses saw a man running from the scene shortly after those shots were fired. Other witnesses saw that man get into Villa's car and drive away with the lights off.

Police found Villa's car, a white four-door 2005 Hyundai Elantra, Tuesday morning in the area of 20th Avenue and Tonto Street, which is about nine miles (15 minutes) from the house where Villa and Furgeri were murdered.

Video from the Fort McDowell Casino News Chopper showed the abandoned Elantra in an alley. It looked like it had been set on fire.

There was no sign of the suspect, who has been identified as Hector Karaca, 24.

While they have not determined a motive for the shooting, investigators believe Karaca knew Villa and Furgeri. They have not said what that connection was.

Karaca is a Hispanic male, 6 feet tall, weighing about 175 pounds. He has black hair and several tattoos, including "South" and "Side" on his forearms, "Tucson" across his upper back, "Chavez" across his stomach, and "smile now cry later" drama masks on his chest.

Police said Karaca should be considered armed and dangerous.

According to the Department of Corrections, Karaca has a criminal record, including incidents of hindering prosecution and car theft, going back to 2006. His most recent offense landed him in prison.

While serving his sentence, Karaca had several disciplinary infractions that ranged in severity from minor, such as unauthorized smoking or disobeying a verbal or written instruction, to major, including rioting.

Karaca got out of prison just last month. Neighbors tell 3TV they've seen him hanging out with Villa in the past few weeks.

If you have any information about Karaca's whereabouts or know anything about what happened inside that Phoenix home Monday night, call the Phoenix Police Department at 602-262-6151. You also can call Silent Witness at 480-WITNESS (948-6277) or 1-800-343-TIPS (8477).